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path: root/drivers/net/usb/cdc_ncm.c
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Diffstat (limited to 'drivers/net/usb/cdc_ncm.c')
-rw-r--r--drivers/net/usb/cdc_ncm.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
index d4425c565..877c9516e 100644
--- a/drivers/net/usb/cdc_ncm.c
+++ b/drivers/net/usb/cdc_ncm.c
@@ -740,12 +740,14 @@ static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
int cdc_ncm_change_mtu(struct net_device *net, int new_mtu)
{
struct usbnet *dev = netdev_priv(net);
- struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
- int maxmtu = ctx->max_datagram_size - cdc_ncm_eth_hlen(dev);
+ int maxmtu = cdc_ncm_max_dgram_size(dev) - cdc_ncm_eth_hlen(dev);
if (new_mtu <= 0 || new_mtu > maxmtu)
return -EINVAL;
+
net->mtu = new_mtu;
+ cdc_ncm_set_dgram_size(dev, new_mtu + cdc_ncm_eth_hlen(dev));
+
return 0;
}
EXPORT_SYMBOL_GPL(cdc_ncm_change_mtu);